[function_seven]

They pee on it.

http://fertsmart.dairyingfortomorrow.com.au/wp-content/uploa...

(Image hotlinked from https://fertsmart.dairyingfortomorrow.com.au/dairy-soils-and...)

[quixoticelixer-]

Yeah but where is that nitrogen coming from? It's coming from plants.

[function_seven]

Yeah, hence the “Nitrogen Cycle”.

[quixoticelixer-]

Yes but they do not actually add nitrogen to the soil

[noselasd]

Sure they do, they add nitrogen back to the soil that the plants extracted from the soil.